JP6440901B2 - projector - Google Patents

Description

  The present invention relates to a projector.

  In recent years, projectors equipped with an image forming panel such as a liquid crystal display element or DMD (Digital Micromirror Device) have become widespread and have high performance.

  Patent Document 1 describes a liquid crystal projector that irradiates a transmissive liquid crystal panel with light from a light source and enlarges and projects an image displayed on the liquid crystal panel onto a screen surface via a projection lens. In the liquid crystal projector disclosed in Patent Document 1, a dichroic mirror that separates light from a light source into R, G, and B component light, and liquid crystal that is irradiated with R, G, and B component light separated by the dichroic mirror, respectively. And a prism that synthesizes R, G, and B images formed through the liquid crystal panels.

  The liquid crystal projector disclosed in Patent Document 1 is configured such that a projection lens, a transmissive liquid crystal panel, and a case for holding a prism can be rotated with respect to a lamp housing that houses a light source. Thereby, it can project on a screen by changing the inclination angle of the optical axis of the projection lens with respect to the light source.

JP 2002-268033 A

  When projecting an image onto a screen using a projector, it is necessary to adjust the projection position on the screen, particularly in the vertical direction, in order to make it easier for the user to observe the image projected on the screen. However, in the liquid crystal projector described in Patent Document 1, when adjusting the projection position on the screen, the tilt angle of the optical axis of the projection lens is changed and adjusted. Changing the tilt angle of the optical axis of the projection lens means that the distance from the projection lens to the screen is changed in the optical axis direction of the projection lens, so every time the tilt angle of the optical axis of the projection lens is changed. In addition, the focus of the projection lens must be changed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projector capable of easily adjusting the projection position on the screen.

  In order to achieve the above object, a projector according to the present invention includes an image forming panel, a light source, a housing, a projection lens, and an angle adjustment for adjusting a mounting angle of the projection lens with respect to the housing around the first optical axis. Department. The image forming panel displays an image. The light source illuminates the image forming panel. The housing houses the image forming panel and the light source. The projection lens includes a first optical system, a first reflecting member, a second reflecting member, a second optical system, and a lens barrel. The first optical system collects illumination light from the image forming panel illuminated by the light source. The first reflecting member is disposed to be inclined with respect to the first optical axis of the first optical system, and deflects the first optical axis to be a second optical axis. The second reflecting member is disposed to be inclined with respect to the second optical axis, deflects the second optical axis, and is parallel to the first optical axis in a plane including the first optical axis and the second optical axis. Three optical axes are assumed. The second optical system projects the illumination light deflected to the third optical axis by the second reflecting member on the projection surface. The lens barrel holds the first optical system, the first reflecting member, the second reflecting member, and the second optical system, and is mounted on the barrel mounting surface of the housing. The angle adjustment unit adjusts the mounting angle of the projection lens with respect to the housing around the first optical axis.

  The lens barrel includes a first holding member that holds the first optical system, a second holding member that holds the second optical system, and a joint portion that joins the first holding member and the second holding member. A first lens in a vertical direction of the casing perpendicular to the first optical axis in an interference region in which the second holding member that houses the second optical system protrudes further toward the casing than the mounting surface of the lens barrel. The dimension from the optical axis to the upper end of the casing is H1, the first optical axis and the dimension from the first optical axis in the left-right direction of the casing perpendicular to the vertical direction to one side surface of the casing, W, the second holding member When the distance of the portion having the shortest distance from the first optical axis is R1, it is preferable to have a relationship of H1 <R1 and W <R1.

  It is preferable that the casing has a corner where the upper end and one side surface intersect each other, and where L is a dimension from the first optical axis to the corner, L <R1.

  When the dimension from the first optical axis to the lower end of the casing in the vertical direction is H2, and the dimension from the third optical axis to the maximum outer diameter in the radial direction of the second holding portion is R2, R2 <H1 and R2 <H2 It is preferable to have the following relationship.

  The angle adjustment unit is between a first mounting angle at which the first optical axis and the third optical axis coincide in the left-right direction and a second mounting angle at which the first optical axis and the third optical axis coincide in the vertical direction. It is preferable to adjust the angle at least.

  The angle adjustment unit preferably supports the lens barrel so as to be rotatable with respect to the housing.

  The angle adjusting unit preferably includes a long hole provided in one of the lens barrel and the housing and a fixing screw that is screwed into the other of the lens barrel and the housing through the long hole.

  The angle adjustment unit includes a long hole and a fixing screw, and rotatably supports the lens barrel with respect to the housing. When the projection lens is at the first mounting angle, one end of the long hole is a fixing screw. In the state where the projection lens is in the second mounting angle, it is preferable that the other end of the long hole is in contact with the fixing screw.

  The angle adjustment unit includes a plurality of attachment holes provided around the first optical axis and one of the plurality of attachment holes in one of the lens barrel and the case, and the lens barrel and the case. It is preferable that a fixing screw that is screwed to the other is provided.

  The angle adjusting unit includes a plurality of mounting holes and fixing screws, and rotatably supports the lens barrel with respect to the housing. The plurality of mounting holes are in a state where the projection lens is set to the first mounting angle. A first mounting hole for screwing the fixing screw, a second mounting hole for screwing the fixing screw with the projection lens at the second mounting angle, and an equiangular angle between the first mounting hole and the second mounting hole It is preferable that the third mounting holes arranged at intervals are included.

  According to the present invention, it is possible to easily adjust the projection position on the screen, and it is not necessary to change the focus after adjusting the projection position, and the adjustment work can be easily performed.

It is a perspective view which shows the projector of this invention. It is a longitudinal cross-sectional view of a projector. It is a perspective view which shows the structure of a fixing | fixed part. It is principal part sectional drawing in alignment with IV-IV in FIG. FIG. 5 is a cross-sectional view of a main part showing a state in which the projection lens is rotated 90 ° clockwise from the state shown in FIG. 4. It is a rear view which shows the positional relationship of the case and projection lens in a 1st attachment angle. It is a rear view which shows the positional relationship of the case and projection lens in a 2nd attachment angle. It is a side view which shows the positional relationship of the case and projection lens in a 1st attachment angle. It is explanatory drawing explaining the projection position adjustment to the screen by the change of the attachment angle of a projection lens. It is a perspective view which shows the structure of the angle adjustment part of 2nd Embodiment. It is principal part sectional drawing of the fixed part periphery of 2nd Embodiment. It is a perspective view which shows the structure of the angle adjustment part of 3rd Embodiment.

[First Embodiment]
As shown in FIG. 1, the projector 2 of the present embodiment includes a projection lens 10, a projector main body 60, and an angle adjustment unit 61.

  As shown in FIG. 2, the projection lens 10 includes a first optical system 11, a second optical system 12, a first mirror 13 as a first reflecting member, a second mirror 14 as a second reflecting member, A first holding member 15, a second holding member 16, and a joint portion 17 are provided. The first holding member 15, the second holding member 16, and the joint portion 17 constitute a lens barrel 18.

  The first optical system 11 includes a first lens 21 and a second lens 22. Although the first lens 21 and the second lens 22 are shown as single lenses for the sake of simplicity of illustration, they are actually composed of a plurality of lens groups. The first optical system 11 condenses illumination light from the image forming panel 67. In the present embodiment, the first optical system 11 forms an image formed by the image forming panel 67 on the imaging surface 23 as an intermediate image.

  The first mirror 13 is disposed between the first optical system 11 and the image plane 23 of the intermediate image by the first optical system 11. The first mirror 13 deflects the optical axis CL1 of the first optical system 11 by reflection to obtain an optical axis CL2. In the present embodiment, the first mirror 13 deflects the optical axis CL1 by 90 ° to be the optical axis CL2.

  The first holding member 15 integrally holds the first optical system 11 and the first mirror 13. The first holding member 15 includes a first main body 24, a mounting cylinder 25, a first lens frame 26, and a second lens frame 27. The 1st main-body part 24 is comprised from the substantially rectangular parallelepiped square tube. One corner portion of the lower plate 24a of the first main body portion 24 is cut obliquely to form a slope portion 24b. The first mirror 13 is fixed to the inner side surface of the slope portion 24b.

  A first mounting hole 24d of the first optical system 11 is formed in the front plate 24c on the entrance side facing the slope portion 24b. An attachment cylinder 25, a first lens frame 26, and a second lens frame 27 are attached to the first attachment hole 24d by attachment screws 28 and 29. Further, instead of or in addition to the mounting screws 28, 29, etc., both may be fixed using an adhesive. A second mounting hole 24 f is formed in the upper plate 24 e of the first main body 24 of the first holding member 15.

  The mounting cylinder 25 has a fitting portion 74 that constitutes an angle adjusting portion 61 described later, and a mounting flange 75.

  The second optical system 12 includes a third lens 35, a fourth lens 36, a fifth lens 37, and a sixth lens 38. The fourth lens 36 to the sixth lens 38 are displayed as single lenses for the sake of simplicity of illustration, but are actually configured by a plurality of lens groups. The second optical system 12 enlarges the intermediate image formed on the image forming surface 23 by the first optical system 11 and projects the enlarged image onto, for example, the screen 39 that is a projection target. The first optical system 11 and the second optical system 12 are described in detail in “Projection Optical System and Projection Display Device” of Japanese Patent Application Nos. 2015-035085 and 2015-045589, for example. These optical systems can be used as the first optical system 11 and the second optical system 12. According to these projection optical systems and projection display devices, it is possible to obtain an optical system having high projection performance in which various aberrations are well corrected at a wide angle.

  The second mirror 14 is disposed between the third lens 35 and the fourth lens 36 of the second optical system 12. The second mirror 14 deflects the optical axis CL2 by reflection to obtain an optical axis CL3. In the present embodiment, the second mirror 14 deflects the optical axis CL2 by 90 ° to be the optical axis CL3.

  In the present embodiment, as described above, the incident-side optical axis CL1 of the first optical system 11 is reflected by the first mirror 13 and deflected by 90 ° to become the outgoing-side optical axis CL2. Further, the optical axis CL2 on the incident side of the second optical system 12 is reflected by the second mirror 14 and deflected by 90 ° to become the optical axis CL3 on the emission side. That is, the optical axis CL3 is parallel to the optical axis CL1 in a plane including the optical axis CL1 and the optical axis CL2. The optical axes CL1 to CL3 correspond to the first to third optical axes of the present invention.

  The second holding member 16 integrally holds the second optical system 12 and the second mirror 14. The second holding member 16 includes a second main body portion 40, a mounting plate 41, a third lens frame 42, a fourth lens frame 43, and a fifth lens frame 44. The 2nd main-body part 40 is comprised from the substantially rectangular parallelepiped square tube. One corner of the upper plate 40a of the second main body 40 is cut obliquely to form a slope 40b. The second mirror 14 is fixed to the inner side surface of the slope portion 40b.

  A third attachment hole 40d is formed in the lower plate 40c on the lower side facing the inclined surface portion 40b in the vertical direction. The exit side end surface of the third lens frame 42 is inserted into the third mounting hole 40d from below vertically. A flange 42 a is formed on the exit side end face of the third lens frame 42. The flange 42a and the lower plate 40c are fixed by a mounting screw 46.

  A flange 40e is extended on the front end face facing the slope portion 40b in the horizontal direction. A mounting plate 41 is fixed to the flange 40e by mounting screws 47. The mounting plate 41 has a mounting hole 41a. A fifth lens frame 44 that holds the sixth lens 38 is inserted into the mounting hole 41a. The fifth lens frame 44 is fixed to the mounting plate 41 by mounting screws 48. The fourth lens frame 43 is fitted on the incident side end of the fifth lens frame 44.

  A flange 42b is formed on the incident side end surface of the third lens frame 42. A mounting hole 57 described later is formed in the flange 42b.

  As shown in FIG. 2, the joint portion 17 includes a screw hole 56, a mounting hole 57, and a mounting screw 58. The screw hole 56 is provided in one of the first holding member 15 and the second holding member 16. In the present embodiment, the screw hole 56 is provided in the upper plate 24 e of the first holding member 15. The attachment hole 57 is provided on the other of the first holding member 15 and the second holding member 16. In the present embodiment, the attachment hole 57 is provided in the flange 42 b of the second holding member 16. The attachment screw 58 is inserted from the attachment hole 57 and screwed into the screw hole 56 to fix the first holding member 15 to the second holding member 16.

  The first holding member 15 and the second holding member 16 are assembled individually. The first holding member 15 and the second holding member are connected via the joint portion 17 in a state where the optical axis CL2 on the emission side of the first optical system 11 and the optical axis CL2 on the incident side of the second optical system 12 are aligned. 16 is joined to assemble the lens barrel 18. In the lens barrel 18 assembled in this way, the optical axis CL1 on the incident side of the first optical system 11 and the optical axis CL3 on the output side of the second optical system 12 with respect to the optical axis CL2 A letter-shaped optical path is formed. Therefore, the lens barrel 18 that holds the first optical system 11, the second optical system 12, the first mirror 13, and the second mirror 14 is a U-shaped barrel.

  The projection lens 10 is attached to the projector main body 60 via the angle adjustment unit 61. In the projector main body 60, a light source 66, an image forming panel 67, and a control unit 68 are housed in a housing 65 having a substantially rectangular parallelepiped shape.

  The image forming panel 67 uses a transmissive liquid crystal panel. The light source 66 is disposed on the back surface of the image forming panel 67, that is, on the opposite side of the projection lens 10 with respect to the image forming panel 67. The light source 66 uses LEDs (Light Emitting Diodes) that simultaneously emit three colors of RGB, and illuminates the image forming panel 67. In place of the LED, a xenon lamp, a halogen lamp, or an ultrahigh pressure mercury lamp that emits white light may be used. The projection lens 10 projects the illumination light from the image forming panel 67 illuminated by the light source 66 onto a projection surface such as the screen 39.

  The control unit 68 turns on the light source 66 and displays an RGB three-color image on the image forming surface 67a. In addition, the control unit 68 also performs the following processing. For example, when the electric control function is incorporated in the projection lens 10, when the operation signal of the zoom dial 71 is received, the size of the image projected on the screen 39 is adjusted. When the operation signal of the focus dial 73 is received, the focus adjustment mechanism (not shown) of the projection lens 10 is operated to adjust the focus of the image projected on the screen 39.

  As shown in FIG. 2, the image is projected on the screen 39 on the upper side with respect to the optical axis CL <b> 3 on the emission side of the second optical system 12. The center of the image forming panel 67 is the direction opposite to the direction in which the center position of the projected image (projection surface of the screen 39) is shifted with respect to the optical axis CL1 on the incident side of the first optical system 11, that is, the first. In the direction of the optical axis CL2 on the emission side of the optical system 11, it is shifted and fixed downward.

  The angle adjustment unit 61 includes a fitting portion 74, a mounting flange 75, a fixing portion 76 (see FIG. 3), a mount ring 77, bearings 78 and 79, and a mount holding portion 80. The mount holding portion 80 is formed in a cylindrical shape and is provided integrally with the housing 65. The mount holding unit 80 holds the mount ring 77 and the bearings 78 and 79.

  The fitting portion 74 is provided at the incident side end of the mounting cylinder 25, and a mounting flange 75 is provided on the emission side of the fitting portion 74. The fitting portion 74 is formed in a cylindrical shape whose outer peripheral surface is fitted to the inner peripheral surfaces of the bearings 78 and 79.

  The bearings 78 and 79 are radial bearing type bearings and are disposed between the mount holding portion 80 and the fitting portion 74. The first optical system 11 is held by aligning the position of the optical axis CL <b> 1 with the central axis of the bearings 78 and 79. Thereby, the projection lens 10 is supported so as to be rotatable around the optical axis CL1.

  The mount ring 77 is formed in a ring shape having an inner diameter that matches the outer diameter of the mounting cylinder 25. The mount ring 77 is fitted into the mount holding portion 80 and covers the bearings 78 and 79.

  As shown in FIG. 3, the mount ring 77 has a mounting surface 77a (lens barrel mounting surface). The mounting surface 77 a is a plane orthogonal to the central axis of the bearings 78 and 79, and faces the mounting surface 75 a of the mounting flange 75 in a state where the fitting portion 74 is fitted to the bearings 78 and 79.

  The fixing portion 76 includes an attachment hole 81, a fixing screw 82, and a screw hole 83. The attachment hole 81 is provided in one of the attachment flange 75 and the mount ring 77. In the present embodiment, the attachment hole 81 is formed in the attachment flange 75. The mounting hole 81 is an arc-shaped long hole that passes through the mounting flange 75 and has the optical axis CL1 as the center. In the present embodiment, the attachment hole 81 is formed in an arc shape having a central angle θ1 of 90 ° (see FIG. 4). The screw hole 83 is provided in the other of the attachment flange 75 and the mount ring 77. In the present embodiment, the mounting ring 77 is provided.

  The screw hole 83 is formed in the attachment surface 77a. The screw hole 83 is disposed in alignment with the mounting hole 81 and is screwed with the fixing screw 82 inserted into the mounting hole 81. As a result, the attachment surfaces 75 a and 77 a are in close contact with each other, and the attachment flange 75 is screwed to the mount ring 77. That is, the lens barrel 18 is fixed to the housing 65 by the fixing portion 76.

  As described above, since the attachment hole 81 is an arc-shaped long hole, the attachment angle of the projection lens 10 with respect to the housing 65 can be adjusted and attached around the optical axis CL1. That is, as shown in FIG. 4, the projection lens 10 is rotated around the optical axis CL1 from the position where the fixing screw 82 is brought into contact with the one end 81A of the mounting hole 81 and screwed into the screw hole 83. As shown in FIG. 5, the mounting angle of the projection lens 10 can be adjusted to a position where the fixing screw 82 is brought into contact with the other end 81 </ b> B of the mounting hole 81 and screwed into the screw hole 83.

  In the present embodiment, since the mounting hole 81 has a central angle θ1 of 90 °, the angle adjusting unit 61 adjusts the mounting angle of the projection lens 10 within an angle range of 90 ° centered on the optical axis CL1. Can do. Specifically, the angle can be adjusted between the first mounting angle shown in FIG. 6 and the second mounting angle shown in FIG. At the first attachment angle, one end 81A of the attachment hole 81 contacts the fixing screw 82, and at the second attachment angle, the other end 81B of the attachment hole 81 contacts the fixing screw 82.

  In the following description, the optical axis CL1 is the X-axis direction, the vertical direction of the casing 65 orthogonal to the X-axis direction is the Z-axis direction, and the left-right direction of the casing 65 is orthogonal to the X-axis direction and Z-axis direction. This is referred to as the Y-axis direction.

  As shown in FIG. 6, at the first mounting angle, the projection lens 10 has the optical axis CL1 and the optical axis CL3 that coincide with each other in the Y-axis direction. As shown in FIG. 7, the optical axis CL1 and the optical axis CL3 coincide with each other in the Z-axis direction at the second mounting angle rotated 90 ° clockwise from the first mounting angle.

  As described above, since the lens barrel 18 is a U-shaped barrel, the second optical system 12 and the second holding member 16 have a portion protruding toward the housing 65 from the mounting surface 77a. As shown in FIG. 8, a portion where the second optical system 12 and the second holding member 16 protrude toward the housing 65 from the mounting surface 77a in the X-axis direction is referred to as an interference region E.

  In the interference region E, the dimension from the optical axis CL1 in the Z-axis direction to the upper end 65A of the housing 65 is H1, the dimension from the optical axis CL1 in the Y-axis direction to one side surface 65B of the housing 65 is W, and the second holding When the distance of the portion having the shortest distance from the optical axis CL1 of the member 16 is R1, the projection lens 10 has a relationship of H1 <R1 and W <R1. Thereby, since there is a margin in the position of the lens barrel 18 with respect to the upper end 65A and the side surface 65B of the casing 65, the lens barrel 18 does not contact the casing 65, and the adjustment of the mounting angle is performed smoothly. be able to.

  The housing 65 has a corner 65C where the upper end 65A and the side surface 65B intersect. When the dimension from the optical axis CL1 to the corner 65C is L, there is a relationship of L <R1. Thereby, since there is a margin in the position of the lens barrel with respect to the corner 65C, when the lens barrel 18 is rotated, the corner 65C is not contacted, and the attachment angle can be adjusted smoothly.

  Further, the dimension from the optical axis CL1 in the Z-axis direction to the lower end 65D of the housing 65 is H2, and in the interference region E, the dimension from the optical axis CL3 to the maximum outer diameter in the radial direction of the second holding member 16 is R2. In this case, there is a relationship of R2 <H1 and R2 <H2. Thereby, in the state which made the projection lens 10 shown in FIG. 7 the 2nd attachment angle, the projection lens 10 does not protrude from the upper end 65A and the lower end 65D of the housing | casing 65. FIG. In the interference region E, since the outer peripheral surface of the fifth lens frame 44 is the largest, the dimension R2 is the distance from the optical axis CL3 to the outer peripheral surface of the fifth lens frame 44.

  When the projector 2 is used, for example, the projection lens 10 is attached at the first attachment angle, and the image on the image forming panel 67 (see FIG. 1) is enlarged and projected onto the screen 39 by the projection lens 10. In order to make it easier for the user to observe the image projected on the screen 39, when the projection position on the screen 39 is to be adjusted, the fixing screw 82 is loosened to release the projection lens 10 from the housing 65. . Then, the mounting angle of the projection lens 10 is adjusted within an angle range from the first mounting angle to the second mounting angle.

  As shown in FIG. 9, the projection lens 10 is rotated about the optical axis CL <b> 1 by the angle α from the first mounting angle, and the fixing screw 82 is tightened to fix the projection lens 10 to the housing 65. In this state, when the difference between the projection position when the projection lens 10 is projected at the first mounting angle is P and the interval between the optical axis CL1 and the optical axis CL3 is D, the projector 2 projects in the Z-axis direction. The position can be shifted by P = D (1−cos α).

  In the projector 2 of the present embodiment, since the attachment angle of the projection lens 10 with respect to the housing 65 around the optical axis CL1 can be adjusted, the projection position on the screen 39 can be easily adjusted. Further, unlike the conventional projector, there is no need to change and adjust the tilt angle of the optical axis of the projection lens with respect to the screen. Therefore, it is not necessary to adjust the focus of the projection lens 10 when adjusting the projection position.

[Second Embodiment]
In the first embodiment, an arc-shaped long hole is formed as the mounting hole 81 constituting the fixing portion 76, and the mounting angle of the projection lens 10 can be adjusted. On the other hand, in 2nd Embodiment shown in FIG. 10, the fixing | fixed part 85 is comprised from the some attachment holes 86A-86E, the fixing screw 82, and the screw hole 83. FIG. In addition, the same code | symbol is attached | subjected to the same structural member as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  In the present embodiment, the five attachment holes 86A to 86E are arranged around the optical axis CL1. The mounting hole 86A (first mounting hole) can be screwed into the screw hole 83 through the fixing screw 82 in a state where the projection lens 10 is at the first mounting angle. On the other hand, the mounting hole 86E (second mounting hole) can be screwed into the screw hole 83 through the fixing screw 82 in a state where the projection lens 10 is at the second mounting angle. As in the first embodiment, the first mounting angle is the mounting angle at which the optical axis CL1 and the optical axis CL3 coincide in the Y-axis direction, and the second mounting angle is the optical axis CL1 in the Z-axis direction. Is the mounting angle at which the optical axis CL3 coincides. For this reason, there is an angular interval of 90 ° around the optical axis CL1 between the mounting hole 86A and the mounting hole 86E.

  As shown in FIG. 11, the attachment holes 86B to 86D (third attachment holes) are arranged at an equal angular interval θ2 between the attachment hole 86A and the attachment hole 86E. As described above, since the angle between the attachment holes 86A and 86E is 90 °, the attachment holes 86A to 86E are arranged every angular interval θ2 = 22.5 °. The projection lens 10 is fixed to the housing 65 by screwing the fixing screw 82 into the screw hole 83 through any one of the mounting holes 86A to 86E.

  In the present embodiment, when adjusting the angle of the projection lens 10 with respect to the housing 65 around the optical axis CL1, the fixing screw 82 screwed into the screw hole 83 via any one of the mounting holes 86A to 86E is loosened. Then, the projection lens 10 is released from being fixed to the housing 65. The projection lens 10 is rotated around the optical axis CL1 to adjust the mounting angle. Then, the projection lens 10 is fixed to the housing 65 by tightening the fixing screw 82 via any one of the mounting holes 86A to 86E different from that before the fixing is released. Thereby, it can adjust with the attachment angle of the multistep matched with the position of the attachment holes 86A-86E from the 1st attachment angle to the 2nd attachment angle.

[Third Embodiment]
In the first and second embodiments, the fixing portion that constitutes the angle adjusting portion 61 is configured from an attachment hole, a fixing screw, and a screw hole, but is not limited thereto, and in the third embodiment shown in FIG. The angle adjustment part 90 is comprised from the key protrusion 91 and several keyway 92A-92E. In addition, the same code | symbol is attached | subjected to the same structural member as 1st and 2nd embodiment, and the overlapping description is abbreviate | omitted.

  The key protrusion 91 is a columnar protrusion disposed on the outer periphery of the fitting portion 74 and extending in parallel with the optical axis CL1. The five key grooves 92 </ b> A to 92 </ b> E are grooves that are formed in the mount ring 77 and fit into the key protrusion 91. The key groove 92 </ b> A can fit the key protrusion 91 in a state where the projection lens 10 is at the first mounting angle. On the other hand, the key groove 92E can fit the key protrusion 91 in a state where the projection lens 10 is at the second mounting angle. As in the first and second embodiments, the first attachment angle is an attachment angle at which the optical axis CL1 and the optical axis CL3 coincide in the Y-axis direction, and the second attachment angle is in the Z-axis direction. The mounting angle is such that the optical axis CL1 and the optical axis CL3 coincide. For this reason, there is an angular interval of 90 ° with the optical axis CL1 as the center between the key groove 92A and the key groove 92E.

  The key grooves 92B to 92D are arranged at an equal angular interval θ2 between the key groove 92A and the key groove 92E. As described above, since the key groove 92A and the key groove 92E have an angular interval of 90 °, the key grooves 92A to 92E are arranged at angular intervals θ2 = 22.5 °.

  In the present embodiment, when adjusting the angle of the projection lens 10 with respect to the housing 65 around the optical axis CL1, the fitting portion 74 is fitted to the mount ring 77, and any one of the key grooves 92A to 92E and the key protrusion are fitted. 91 is fitted. Thereby, it can adjust with the mounting angle of the multistep matched with the position of keyway 92A-92E from a 1st attachment angle to a 2nd attachment angle.

  In each of the above embodiments, the mounting angle of the projection lens 10 with respect to the housing 65 can be adjusted within an angle range of 90 ° between the first mounting angle and the second mounting angle. For example, the adjustment may be made in an angle range that is greater than 90 ° including the first attachment angle and the second attachment angle.

  In the above embodiment, a transmissive liquid crystal panel is used as the image forming panel 67, but a reflective liquid crystal panel may be used. In this case, a light source 66 is disposed on the front side of the image forming panel 67 and irradiates three colors of RGB simultaneously. When a DMD is used as the image forming panel 67, the light source 66 is disposed on the front side of the image forming panel 67, and the RGB three-color LEDs are caused to emit light in a time-sharing manner in synchronization with the DMD three-color image formation timing. .

  In each of the above embodiments, the first holding member 15 constituting the lens barrel 18 is formed in a rectangular tube shape. However, the present invention is not limited to this. For example, the corner on the lower end side of the first holding member 15 is chamfered. You may form in a shape or a curved surface shape. Thereby, even when the dimension H2 from the optical axis CL1 in the Z-axis direction to the lower end 65D of the housing 65 is short, the corner of the first holding member 15 does not protrude from the lower end 65D of the housing 65.

  In each of the above embodiments, the projector 62 has been described as being arranged on a table. However, the present invention can also be applied to a case where the projector 62 is suspended from a ceiling or the like. Moreover, although the example which projects an image on the screen 39 demonstrated, the projection surface is not limited to the screen 39, It can be used as a projector which projects with respect to various projection surfaces.

  In the above embodiments, terms such as orthogonal and parallel are used to represent the positional relationship between a plurality of optical axes, or a specific numerical angle such as 90 ° is used. However, these include a range that is allowed with an error corresponding to the accuracy required in the optical system.

2 projector 10 projection lens 11 first optical system 12 second optical system 13 first mirror 14 second mirror 15 first holding member 16 second holding member 17 joint 18 lens barrel 21 first lens 22 second lens 23 Image surface 24 First body portion 24a Lower plate 24b Slope portion 24c Front plate 24d First mounting hole 24e Upper plate 24f Second mounting hole 25 Mounting tube 26 First lens frame 27 Second lens frame 28 Mounting screw 29 Mounting screw 35 First 3 lens 36 4th lens 37 5th lens 38 6th lens 39 Screen 40 2nd main body 40a Upper plate 40b Slope 40c Lower plate 40d Third mounting hole 40e Flange 41 Mounting plate 41a Mounting hole 42 Third lens frame 42a, 42b Flange 43 Fourth lens frame 44 Fifth lens frame 46 to 48 Mounting screw 56 Screw hole 57 Mounting hole 58 Mounting screw 60 Project Main body 61 Angle adjustment unit 62 Projector 65 Housing 65A Upper end 65B Side surface 65C Corner 65D Lower end 66 Light source 67 Image forming panel 67a Image forming surface 68 Control unit 71 Zoom dial 73 Focus dial 74 Fitting portion 75 Mounting flange 75a Mounting surface 76 Fixed Portion 77 Mount ring 77a Mounting surface 78, 79 Bearing 80 Mount holding portion 81 Mounting hole 81A One end 81B The other end 82 Fixing screw 83 Screw hole 85 Fixing portion 86A to 86E Mounting hole 90 Angle adjusting portion 91 Key protrusion 92A to 92E Keyway

Claims (10)

An image forming panel for displaying an image;
A light source that illuminates the image forming panel;
A housing for housing the image forming panel and the light source;
A first optical system that collects illumination light from the image forming panel illuminated by the light source; and a first optical system that is inclined with respect to the first optical axis of the first optical system, and deflects the first optical axis. A first reflecting member that is a second optical axis, and is inclined with respect to the second optical axis, deflects the second optical axis, and includes the first optical axis and the second optical axis. A second reflecting member having a third optical axis parallel to the first optical axis in a plane, and a second optical system for projecting illumination light deflected to the third optical axis by the second reflecting member onto the projection surface A projection lens, and a lens barrel that holds the first optical system, the first reflecting member, the second reflecting member, and the second optical system, and is attached to the lens barrel mounting surface of the housing; ,
An angle adjustment unit for adjusting an attachment angle of the projection lens with respect to the casing around the first optical axis;
With projector. The lens barrel includes a first holding member that holds the first optical system, a second holding member that holds the second optical system, and a joint that joins the first holding member and the second holding member. A U-shaped lens barrel having a portion,
In the interference region in which the second holding member that houses the second optical system protrudes from the lens barrel mounting surface to the housing side,
The dimension from the first optical axis to the upper end of the casing in the vertical direction of the casing orthogonal to the first optical axis is H1, and the horizontal direction of the casing orthogonal to the first optical axis and the vertical direction H1 <R1 and W1 is the dimension from the first optical axis to one side surface of the housing in R1 and R1 is the distance of the portion of the second holding member that is the shortest distance from the first optical axis. The projector according to claim 1, wherein a relationship of W <R1 is satisfied. The housing has a corner where the upper end and the one side face intersect,
3. The projector according to claim 2, wherein when a dimension from the first optical axis to the corner is L, a relationship of L <R 1 is satisfied.   When the dimension from the first optical axis to the lower end of the housing in the vertical direction is H2, and the dimension from the third optical axis to the maximum outer diameter in the radial direction of the second holding member is R2, R2 < 4. The projector according to claim 2, wherein a relationship of H1 and R2 <H2 is satisfied.   The angle adjustment unit includes a first mounting angle at which the first optical axis and the third optical axis coincide with each other in the left-right direction, and a first optical axis and the third optical axis that coincide with each other in the vertical direction. The projector according to any one of claims 2 to 4, wherein the angle is adjusted at least between the second mounting angle.   The projector according to claim 2, wherein the angle adjustment unit rotatably supports the lens barrel with respect to the housing.   The angle adjustment unit includes a long hole provided in one of the lens barrel and the casing, and a fixing screw that is screwed into the other of the lens barrel and the casing through the long hole. The projector according to claim 6.   The angle adjustment unit includes a long hole provided in one of the lens barrel and the housing, and a fixing screw that is screwed into the other of the lens barrel and the housing through the long hole, In a state where the lens barrel is rotatably supported with respect to the housing and the projection lens is at the first mounting angle, one end of the elongated hole is in contact with the fixing screw, and the projection lens is The projector according to claim 5, wherein the other end of the elongated hole is in contact with the fixing screw in the second mounting angle state.   The angle adjustment unit includes the lens through one of the plurality of mounting holes provided around the first optical axis and one of the plurality of mounting holes in one of the lens barrel and the casing. The projector according to claim 6, further comprising a lens barrel and a fixing screw screwed into the other of the casing. The angle adjustment unit includes the lens through one of the plurality of mounting holes provided around the first optical axis and one of the plurality of mounting holes in one of the lens barrel and the casing. A fixing screw that is screwed to the other of the lens barrel and the housing, and the lens barrel is rotatably supported with respect to the housing;
The plurality of mounting holes include a first mounting hole for screwing the fixing screw in a state where the projection lens is at the first mounting angle, and a fixing screw in a state where the projection lens is at the second mounting angle. The projector according to claim 5, comprising: a second mounting hole to be screwed together; and a third mounting hole disposed at an equiangular interval between the first mounting hole and the second mounting hole.

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